constant species(constancy) In phytosociology, a species common to a particular association or community, but not necessarily confined to that community; a species of wide ecological amplitude compared with a faithful species. A species of high constancy would be present in all, or almost all, of a series of relevés or field samples that describe an association or community.

constant species (constancy) In phytosociology, a species common to a particular association or community, but not necessarily confined to that community; a species of wide ecological amplitude compared with a faithful species. A species of high constancy would be present in all, or almost all, of a series of relevés or field samples that describe an association or community.